Procoagulant and anticoagulant factors in childhood hypothyroidism

Area of Science:

• Pediatric Endocrinology
• Hematology
• Coagulation Science

Background:

• Thyroid hormones play a crucial role in various physiological processes, including hemostasis.
• Deficiencies in thyroid hormones during childhood may affect the complex balance of the coagulation system.

Purpose of the Study:

• To investigate the impact of childhood hypothyroidism on procoagulant and anticoagulant proteins.
• To assess the changes in coagulation parameters following thyroid hormone replacement therapy.

Main Methods:

• A cohort study involving 54 children with hypothyroidism and 55 healthy controls (aged 1 month-16 years).
• Evaluation of thyroid function tests, procoagulant (e.g., fibrinogen, von Willebrand factor [vWF], FVIII), and anticoagulant proteins (e.g., Antithrombin [AT], Protein C [PC], Protein S [PS], free Protein S [fPS]).
• Reevaluation of parameters one year after initiating Na-L-thyroxine treatment.

Main Results:

• Children with hypothyroidism exhibited decreased levels of fibrinogen, TT, AT, PC, PS, and fPS, alongside increased APTT, fibrinogen, and TT.
• Following treatment, significant increases were observed in vWF, FVIII, AT, PC, PS, and fPS.
• A positive correlation was noted between free thyroxine (fT4) levels and vWF, FVIII, PC, and PS.

Conclusions:

• Childhood hypothyroidism is associated with significant alterations in the coagulation system, affecting both procoagulant and anticoagulant pathways.
• Thyroid hormone replacement therapy can normalize many of these coagulation abnormalities.
• Close monitoring of coagulation parameters, including vWF, FVIII, and anticoagulant proteins, is recommended for children with hypothyroidism.